华北地台东西部中新元古界生烃条件比较研究

Comparative research on hydrocarbon generation conditions of Meso-Neoproterozoic between east and west of North China Platform

林玉祥 李晓凤 闫晓霞 郭凤霞 刘虎 李秀芹

Lin Yuxiang Li Xiaofeng Yan Xiaoxia Guo Fengxia Liu Hu Li Xiuqin

山东科技大学 地球科学与工程学院, 山东 青岛 266590

College of Geological Science and Engineering, Shandong University of Science and Technology, Qingdao, Shandong 266590, China

通过对华北地台中新元古界有机质丰度、类型、热演化程度以及生烃演化史等的分析，全面对比了以蒙陕裂陷槽为代表的华北地台西部和以冀辽裂陷槽为代表的华北地台东部中新元古界的生烃条件，结果表明，冀辽裂陷槽中新元古界烃源岩有机质丰度高、类型好，为优质烃源岩；蒙陕裂陷槽中新元古界烃源岩有机质丰度低，尽管类型也较好，烃源岩仅为中等-偏差。华北地台东、西部中新元古界现今热演化程度较为接近，但其热演化过程差异较大，东部自晚古生代以后持续抬升，上覆地层剥蚀殆尽；西部则持续沉降，至中生代方达到最高演化程度。总体看来，华北地台中新元古界有利生烃区首推冀辽裂陷槽，其次为蒙陕裂陷槽和豫陕裂陷槽。

Based on the analysis of the abundance, type, thermal evolution degree of organic matter and the hydrocarbon generation history in Meso-Neoproterozoic in the North China Platform, the western part of the platform represented by the Mengshan Aulacogen was compared with the eastern part represented by the Jiliao Aulacogen in hydrocarbon generation condition. The hydrocarbon source rocks of Meso-Neoproterozoic in the eastern part of the North China Platform are premium source rocks for high abundance and good type of organic matter while the western hydrocarbon source rocks with low abundance of organic matter are only medium to bias, even though their type is also good. Although the thermal evolution of the eastern part is similar to the western part, their thermal evolutions are quite different from the Late Paleozoic: the eastern part uplifted in succession and the overlying strata denuded; while the western part continued to subside and achieved the highest thermal evolution degree in Mesozoic. Generally speaking, the Jiliao Aulacogen is the most favorable hydrocarbon generation area in the North China platform, then the Mengshan Aulacogen and the Yushan Aulacogen.

国家自然科学基金面上项目(41172108)、国家油气专项“十二五”课题(2011ZX05033-04，2011ZX05004-01) 和中国石油“十二五”科技攻关课题(2011A-0203)资助。

https://doi.org/10.11781/sysydz201405618